Its almost like you actively ignored where I pointed out Deckard which is strongly beleived to be a “fanny pack” VR.

I did. Partially because it is a rumour and not an actual product yet but also because, quite crucially to the point, it won't be a Steam Deck form factor PC. Because my entire point hinges around:

Steam Deck form factor + conventional VR setup with all the typical wires and stuff = considerable liability and just not fun.

My argument is not about the Linux OS but the form factor of the Steam Deck. A problem that wouldn't be solved by slapping Windows on it.